Improved door and shutter spring



UNITED STATES PATENT OFFICE.

LORENZ BOMMER, OF NEW YORK, N. Y.

IMPROVED DOOR. AND SHUTTER SPRING.

Specification forming part of Letters Patent No. 38,023, dated March 31,1863.

To all whom it may concern:

Be it known that I, LORENZ BoMMER, of the city, county, and State of NewYork, have invented a new and Improved Door and Shutter Spring and I dohereby declare that the following is a full,clear,v and exactdescription of the same, reference being had to the accom panyingdrawings, making a part of this speciiication, in which- Figure l is aface view of a door with my invention applied to it; Fig. 2, a detachedview of the spring 3 Fig. 3, a detached view of the case of the spring;Fig. 4., a top or plan view of the device shown in the position itassumes where the door is half open; Fig. 5, an end view of one of thepintles of the spring; Fl g. 6, an end view of the spring.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention consists in the employment or use of a spiral springprovided with a pintle at each end, and arranged and applied to the dooror shutter in such a manner that its tension may be regulated as desiredso as to act more or less powerfully upon the door as may be required.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A represents a door, and B a door-frame, the door being hinged to theframe in the usual or any proper way.

O O, Fig. 1, represent the hinges.

D is a spiral spring, the convolutions of which are in close contact.This spring may be ot' any suitable length and diameter, and its upperand lower ends are bent inward toward the center of the spring, as shownat ax, Fig. 6.

E E are the pintles, which are of such diameter that they may be fittedinto the ends of the spring. These pintles are each provided with ashoulder, a, and these shoulders bear against the ends of the springs,as shown clearly in Figs. 1 and 2. The upper pintle, E, has a head, d,formed on it, which is perforated with holes c, and into any one ofthese holes a pin, F, is fitted. The lower pintle, E', is provided withor has a plate, G, attached to it, in which screw-holes are made toadmit of said plate and its pintle being secured to the door-frame B.The upper pintle, E, is not attached to the door-frame. It has a plate,H, fitted on its head b, and this plate is allowed to turn on the headand rest on the shoulder a. (See Fig. 2.) The plate H has a plate, I,attached to it at right angles, and the latter plate has screw-holes emade in it through which screws pass to secure said plate to the door.fr The pintles E E are each slotted at their inner ends, as shown at fin Fig. 5. These slots may extend wholly or partially across thepintles. They are shown as extending half-way across it in Fig. 5. Thebent ends a* of the spring D are tted in the slots f of the pintles EE', and on the plate H, which is fitted on the head b of the upperpintle, E, there is a vertical projection, g, against which the pin F inthe head b bears.

From the above description it will be seen that the spring D is made toact upon the door A through the medium of the upper pintle, E, pin F,and the projection on the plate H, and the door will consequently bekept in a closed state when not forcibly opened. When the door isopened, the spring A will be twisted in consequence of the projection gbearing against the pin F, and when the door is released the spring Dinstantly closes it. The strength of the spring may be regulated asdesired by adjusting the pin F in different holes, c, inthe head b ofthe upper pintle, E. This is effected by inserting a small rod in one ofthe holes c and turning the head so as to twist or wind the spring toincrease its i tension,'and then inserting the piu F in a hole, c, nearthe projection g. The spring D should be encompassed by a cylinder, I.(Shown in Figs. l and 3.) This cylinder serves as a case for the spring,and eifectually protects it from the weather.

The principal advantage of this spring consists in the readiness inwhich it may be applied to the door and the small cost of itsmanufacture, together with the facility in regulating its strength ortension. When applied to a door. or shutter, it does not present anunsightly appearance, as most other springs for the same purpose, and itis not liable to get out of repair or become deranged by use.

Having thus described my invention, what I claim as new, and desire tosecure Letters Patent, is

The plate H, with the projection g and plate I, in combination with thepintle E and pin F, constructed and applied substantially as and for thepurpose specified.

Witnesses: LORENZ BOMMER.

M. S. PARTRIDGE, DANIEL RonEETsoN.

